Some ideas that can help balance the battle between attackers and defenders:
-The more portals a clan has, the more frequent mobs attacks should be. (already mentioned by other players, but worth reinforcing).
-Be possible to steal portals fame, without the need to drain them completely. (because it is difficult to get to drain portals to 0%, especially if there are few attackers).
-Increase the drain percentage of a portal. (with the new "jump gates" defenders would arrive faster, thus making it difficult for attackers to drain efficiently).
-The attacked portal will only return to its normal ''green'' state if at least one defender is healing for some time.
Attacked portals continue to produce fame, not as much as if they were in a normal state, of course. (but this would help the attackers to keep stealing fame during the map attack, otherwise, on the first attacked portal or even before the attack starts, the defenders they would simply collect the fame of the whole map and so the attackers would not have anything and would waste time and money, as is currently the case).
-Be possible to revive in attacked portals. The normal time to revive in a ''green'' portal is 15 seconds, in a red portal the time would increase to 45 seconds, just revive. (during wars the attackers are the ones who die the most, and in a completely attacked map, they are forced to revive in another map, or in dinoville, making them give up faster etc...)
-Increase the time to use Recovery Kits. (It's already hard to face dominants, and it gets even harder, when players keep using recovery kits every 5 seconds after they die.)
-Maps like Maujak and CCV are difficult to attack as they are expensive to revive and teleport and they contain the highest concentration of active players (the dominant ones). So fame production on these maps should be lower or be attacked more often by mobs.
Most players nowadays don't want to leave the ''comfort zone'' they want to have a map and dominate the elections and still have the good life of hunting in peace. they team up in massive alliances to crush enemies and have even less work defending maps.
I believe that to end the monopoly of alliances, defenders have to wear out as much as attackers, it's a simple logic, if a clan wants to have a map 24h, it will have to work 24h for it. And that would also help defenders to have more responsibility in choosing their leaders and choosing players who really try hard for positions. That way, ''corrupt'' leaders wouldn't have so much freedom to give positions to friends or players who don't deserve it.